.page-about {
  --tl-year-size: clamp(40px, 13vw, 76px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(36px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 78%);
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 92px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 15ch;
  margin: .16em 0 .4em;
}

.page-about .about-hero .lede {
  max-width: 62ch;
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.8;
  color: var(--body-text);
  margin: 0;
}

.page-about .about-hero__ekg {
  display: block;
  width: min(440px, 74%);
  height: 34px;
  margin: clamp(18px, 3vw, 30px) 0;
  color: var(--neon);
  opacity: .88;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stats li {
  background: var(--stand);
  padding: 16px 16px 18px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--neon);
}

.page-about .about-stat__key {
  display: block;
  margin-top: 9px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mute);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  align-items: start;
}

.page-about .about-origin__text .title-lg {
  margin: .12em 0 .5em;
}

.page-about .about-origin__link {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-origin__figure {
  margin: clamp(28px, 5vw, 0px) 0 0;
  border: 2px solid var(--print);
  box-shadow: 8px 8px 0 rgba(43, 30, 22, .55);
  transform: rotate(-1.2deg);
}

.page-about .about-origin__figure .figure__caption {
  background: var(--paper);
  color: var(--print);
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 时间轴 ---------- */
.page-about .about-trail__head {
  max-width: 68ch;
}

.page-about .about-trail__head .title-lg {
  margin: .12em 0 .4em;
}

.page-about .about-trail__note {
  margin: 0;
  color: var(--body-text);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 4vw, 34px) 0 clamp(30px, 5vw, 52px);
}

.page-about .about-jump a {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  padding: 8px 15px;
  border: 1px solid var(--line);
  color: var(--body-text);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
  background: var(--neon-soft);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--ember), var(--neon) 38%, var(--data) 72%, rgba(79, 195, 247, 0) 100%);
  opacity: .7;
}

.page-about .tl-item {
  position: relative;
  padding-left: 44px;
  padding-bottom: clamp(30px, 6vw, 60px);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 16px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--ember);
  box-shadow: 0 0 0 5px rgba(255, 122, 26, .12);
}

.page-about .tl-year {
  display: block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--tl-year-size);
  line-height: .86;
  letter-spacing: -.03em;
  color: var(--neon);
  text-shadow: 0 0 26px rgba(201, 255, 61, .22);
}

.page-about .tl-card {
  background: var(--turf);
  border: 1px solid var(--line);
  padding: clamp(18px, 3.4vw, 30px);
  transform: rotate(-.5deg);
}

.page-about .tl-card--paper {
  background: var(--paper);
  border: 2px solid var(--print);
  box-shadow: 7px 7px 0 rgba(43, 30, 22, .5);
  transform: rotate(.7deg);
}

.page-about .tl-card--paper h3,
.page-about .tl-card--paper p {
  color: var(--print);
}

.page-about .tl-card--paper .tl-tag {
  background: var(--print);
  color: var(--paper);
}

.page-about .tl-tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--paper);
}

.page-about .tl-card .title-md {
  margin: 0 0 .5em;
}

.page-about .tl-card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-about .tl-meta {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  border-top: 1px dashed var(--line);
}

.page-about .tl-card--paper .tl-meta {
  border-top-color: rgba(43, 30, 22, .3);
}

.page-about .tl-meta li {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--data);
}

.page-about .tl-card--paper .tl-meta li {
  color: var(--print);
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 clamp(32px, 6vw, 60px);
  border: 1px solid var(--line);
}

.page-about .about-team__figure .figure__caption {
  background: var(--stand);
  color: var(--mute);
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .about-team__intro {
  max-width: 68ch;
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-team__intro .title-lg {
  margin: .12em 0 .4em;
}

.page-about .about-team__lede {
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-about .team-list {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-row {
  background: var(--stand);
}

.page-about .team-row > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2.6vw, 21px);
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .team-row > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-row > summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--neon);
}

.page-about .team-row[open] > summary::after {
  content: "－";
}

.page-about .team-row__role {
  flex: 1 1 auto;
}

.page-about .team-row__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--neon);
  letter-spacing: .02em;
  white-space: nowrap;
}

.page-about .team-row__body {
  padding: 0 18px 20px;
}

.page-about .team-row__body p {
  margin: 0;
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-about .about-team__bar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-team__bar-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border-left: 3px solid var(--ember);
  background: linear-gradient(90deg, rgba(255, 122, 26, .1), rgba(255, 122, 26, 0));
}

.page-about .about-team__bar-val {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--ember);
  white-space: nowrap;
}

.page-about .about-team__bar-key {
  font-size: 15px;
  line-height: 1.6;
  color: var(--body-text);
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow__lede {
  max-width: 66ch;
  margin: 0 0 clamp(24px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-about .flow-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .flow-step {
  position: relative;
  padding: 24px 20px 26px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--turf), var(--stand));
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), rgba(201, 255, 61, 0));
  opacity: .6;
}

.page-about .flow-step__no {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(42px, 9vw, 58px);
  line-height: .82;
  margin-bottom: 16px;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--data);
}

.page-about .flow-step__title {
  margin: 0 0 .5em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 3vw, 22px);
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-about .about-flow__foot {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--beat);
  font-size: 16px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 70ch;
}

/* ---------- 生态 ---------- */
.page-about .about-eco__panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--stand);
  padding: clamp(24px, 5vw, 58px);
}

.page-about .about-eco__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
}

.page-about .about-eco__body {
  position: relative;
  z-index: 1;
}

.page-about .about-eco__body .title-lg {
  margin: .12em 0 .5em;
}

.page-about .about-eco__prose {
  max-width: 68ch;
}

.page-about .eco-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .eco-stats li {
  background: var(--ink);
  padding: 16px;
}

.page-about .eco-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--data);
}

.page-about .eco-stats__key {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mute);
}

/* ---------- 合作与加入 ---------- */
.page-about .about-join__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  padding: clamp(24px, 5vw, 52px);
  border: 2px solid var(--print);
  background: var(--paper);
  box-shadow: 10px 10px 0 rgba(43, 30, 22, .5);
}

.page-about .about-join__text .kicker {
  color: var(--print);
}

.page-about .about-join__text .title-lg {
  color: var(--print);
  margin: .12em 0 .5em;
}

.page-about .about-join__text p {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--print);
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

.page-about .about-join__actions .btn--ghost {
  color: var(--print);
  border-color: var(--print);
}

.page-about .about-join__actions .btn--ghost:hover,
.page-about .about-join__actions .btn--ghost:focus-visible {
  color: var(--paper);
  background: var(--print);
  border-color: var(--print);
}

.page-about .about-join__actions .btn--neon {
  color: var(--print);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .eco-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team__bar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }

  .page-about .about-team__bar-item {
    background: var(--stand);
    border-left: none;
    border-top: 2px solid var(--ember);
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 18px 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 172px;
  }

  .page-about .about-timeline::before {
    left: 150px;
  }

  .page-about .tl-item {
    padding-left: 0;
    padding-bottom: clamp(36px, 5vw, 68px);
  }

  .page-about .tl-item::before {
    left: 143px;
    top: 20px;
  }

  .page-about .tl-year {
    position: absolute;
    left: -172px;
    top: 6px;
    width: 132px;
    text-align: right;
    margin: 0;
  }

  .page-about .tl-card {
    max-width: 60ch;
  }

  .page-about .tl-item:nth-child(even) .tl-card {
    margin-left: clamp(0px, 5vw, 72px);
  }

  .page-about .about-origin__figure {
    margin-top: 12px;
  }

  .page-about .about-join__panel {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-about .flow-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-row > summary {
    padding: 20px 22px;
  }

  .page-about .team-row__body {
    padding: 0 22px 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    max-width: 14ch;
  }

  .page-about .tl-card {
    max-width: 62ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-origin__figure,
  .page-about .tl-card,
  .page-about .tl-card--paper {
    transform: none;
  }

  .page-about .about-jump a {
    transition: none;
  }
}